稀土在蠕墨铸铁中的适宜残留量范围

The Proper Range of Residual Rave Earth in Vermicular Graphite Cast Iron

本文研究了用铈组混合稀土金属和1＃稀土硅铁合金作为蠕化剂时的稀土残留量上限REmax,下限REmin、残留量范围△RE。得出用混合稀土金属处理蠕铁时REmax=0.11％,REmin=0.038％,△RE=0.072％。而用1＃稀土硅铁合金处理时,REmax=0.091％,REmin=0.037％,△RE=0.054％。并在此范围内两者的蠕化率都与稀土残留量有线性关系。本文同时还研究了硫对蠕铁中稀土残留量范围的影响。

Synopsis: The Paper investigates the upper limit REmax. iower limit REmin, and the rangs of residual Rare Earth △RE in vermicular graphite cast iron treated with Mischmetai and R24 RE—ferrosilicon alloy. It is concluded that REmax=0. 11%, REmin～0.038%. △RE=0.072% when treated with Mischmetal and REmax=0.091%. REmin=0.031%. △RE=0.054% When treated with R24 alloy. And within these ranges the fraction of virmicular graphite has linear relation with th residual RE. The paper also in vestigates the effect of S on of the range of residual RE invermicular iron.